OSAS is dependent on a denial of this passage of scripture.
Rom 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Rom 8:4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
The above passage reveals...
1. "No condemnation" is associated with walking after the Spirit.
and
2. The Spirit of life in Jesus Christ is associated with a freedom from the law of sin and death.
Those who uphold OSAS simply cannot associate any "walk" (ie. what one manifestly "does" in practice) with the reprieve from condemnation that God offers sinner whom repent. Thus that above passage, by necessity, must be ignored.
Not only that, but those whom uphold OSAS must, by necessity, hold to a false definition of "salvation" which has NOTHING to do with actually being set free from the law of sin and death. This is an even more significant point then the previous one.
Paul connects a being "set free" to "obedience to the truth from the heart."
Rom 6:17 But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.
Rom 6:18 Being then made free from sin, ye became the servants of righteousness.
The above two verses reveal...
1. "Obedience from the heart" (to the doctrine delivered) is connected to "being made free from the service of sin."
This premise is also given greater emphasis by the following words of Paul...
Rom 6:16 Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?
...which reveals...
1. "Obedience unto righteousness" is the opposite of "sin unto death."
If "Obedience unto righteousness" is connected to "being set free from serving sin" and if "no condemnation" is connected to "walking after the Spirit" then it is very obvious that being "set free from the law of sin and death" by the "Spirit of life in Jesus Christ" is a reference to a MANIFEST STATE OF REALITY in which one is....
1. Obeying God by walking after the Spirit.
2. Not disobeying unto unrighteousness.
3. Serving righteousness instead of sin.
4. Not sinning unto death.
This sentiment perfectly matches the following...
Tit 2:14 Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
Jesus gave Himself for us that...
1. He might redeem us from ALL iniquity.
2. Purify unto himself a weird people zealous of righteousness.
Thus if we look at verses 3 and 4 of Romans 8:1-4 we read...
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Rom 8:4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
Rom 8:5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
The righteousness of the law is fulfilled IN those whom WALK after the Spirit. Paul taught the following...
Gal 5:4 Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
Gal 5:5 For we through the Spirit wait for the hope of righteousness by faith.
Gal 5:6 For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
"Justified by the law" is opposed to "justification by faith."
FAITH WORKS BY LOVE and LOVE FULFILLS THE LAW.
Rom 13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
...
Rom 13:10 Love worketh no ill to his neighbour: therefore love is the fulfilling of the law.
...
Gal 5:14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
Again Paul wrote...
Rom 8:4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
Salvation is a MANIFEST STATE.
Salvation is of WALKING AFTER THE SPIRIT.
Those whom promote OSAS view salvation is purely POSITIONAL and thus deny that "doing" is associated with its reality at all. That is why they can defend one "being saved" and one "walking according to the lusts of the flesh" at the same time.
Those whom uphold OSAS and even those who deny OSAS yet uphold temporal justification when one is still serving sin in rebellion to God are all teaching the old lie of...
Ye can sin and not surely die.
Strip all the fluff from the writings of these people and this is what it comes down to. They literally believe they can sin and not surely die.
Gen 3:3 But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die.
Gen 3:4 And the serpent said unto the woman, Ye shall not surely die:
They believe they can do the following without the resulting death...
Jas 1:14 But every man is tempted, when he is drawn away of his own lust, and enticed.
Jas 1:15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
They do not believe nor teach any escape from the corruption that is in the world through lust...
2Pe 1:3 According as his divine power hath given unto us all things that pertain unto life and godliness, through the knowledge of him that hath called us to glory and virtue:
2Pe 1:4 Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
The question every single one of us ought to ask is have we escaped the corruption that is in the world through lust?
For it is only in escaping this corruption that we escape condemnation and death. We escape this corruption through repentance and faith whereby we abide in the Spirit of life IN Jesus Christ.